bin/date/date.c

   1 /*
   2  * Copyright (c) 1985, 1987, 1988, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)date.c   8.2 (Berkeley) 4/28/95
  30  * $FreeBSD: src/bin/date/date.c,v 1.47 2005/01/10 08:39:21 imp Exp $
  31  */
  32
  33 #include <sys/param.h>
  34 #include <sys/time.h>
  35
  36 #include <ctype.h>
  37 #include <err.h>
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <syslog.h>
  42 #include <unistd.h>
  43 #include <locale.h>
  44 #include <libutil.h>
  45 #include <utmpx.h>
  46
  47 #include "vary.h"
  48
  49 #ifndef TM_YEAR_BASE
  50 #define TM_YEAR_BASE    1900
  51 #endif
  52
  53 static time_t tval;
  54
  55 static void badformat(void);
  56 static void setthetime(const char *, const char *, int);
  57 static void usage(void);
  58
  59 static const struct iso8601_fmt {
  60         const char *refname;
  61         const char *format;
  62 } iso8601_fmts[] = {
  63         { "date", "%Y-%m-%d" },
  64         { "hours", "%Y-%m-%dT%H" },
  65         { "minutes", "%Y-%m-%dT%H:%M" },
  66         { "seconds", "%Y-%m-%dT%H:%M:%S" },
  67 };
  68 static const struct iso8601_fmt *iso8601_selected;
  69
  70 static const char *rfc2822_format = "%a, %d %b %Y %T %z";
  71
  72 int
  73 main(int argc, char **argv)
  74 {
  75         int ch, rflag;
  76         int Iflag, jflag, Rflag;
  77         const char *format;
  78         char buf[1024], tzbuf[8];
  79         char *fmt;
  80         char *tmp;
  81         struct vary *v;
  82         const struct vary *badv;
  83         struct tm lt;
  84         size_t i;
  85
  86         v = NULL;
  87         fmt = NULL;
  88         setlocale(LC_TIME, "");
  89         rflag = 0;
  90         Iflag = jflag = Rflag = 0;
  91         while ((ch = getopt(argc, argv, "d:f:I::jnRr:uv:")) != -1) {
  92                 switch (ch) {
  93                 case 'f':
  94                         fmt = optarg;
  95                         break;
  96                 case 'I':               /* ISO 8601 datetime format */
  97                         if (Rflag)
  98                                 errx(1, "multiple output formats specified");
  99                         Iflag = 1;
 100                         if (optarg == NULL) {
 101                                 iso8601_selected = iso8601_fmts;
 102                                 break;
 103                         }
 104                         for (i = 0; i < nitems(iso8601_fmts); i++) {
 105                                 if (strncmp(optarg, iso8601_fmts[i].refname,
 106                                             strlen(optarg)) == 0)
 107                                         break;
 108                         }
 109                         if (i == nitems(iso8601_fmts))
 110                                 errx(1, "invalid argument '%s' for -I", optarg);
 111                         iso8601_selected = &iso8601_fmts[i];
 112                         break;
 113                 case 'j':
 114                         jflag = 1;      /* don't set time */
 115                         break;
 116                 case 'n':               /* don't set network */
 117                         break;
 118                 case 'R':               /* RFC 2822 datetime format */
 119                         if (Iflag)
 120                                 errx(1, "multiple output formats specified");
 121                         Rflag = 1;
 122                         break;
 123                 case 'r':               /* user specified seconds */
 124                         rflag = 1;
 125                         tval = strtoll(optarg, &tmp, 0);
 126                         if (*tmp != 0)
 127                                 usage();
 128                         break;
 129                 case 'u':               /* do everything in UTC */
 130                         if (setenv("TZ", "UTC0", 1) != 0)
 131                                 err(1, "setenv: cannot set TZ=UTC0");
 132                         break;
 133                 case 'd':
 134                 case 'v':
 135                         if (strncmp(optarg, "TZ=", 3) == 0) {
 136                                 tmp = strdup(optarg);
 137                                 size_t tzlen;
 138
 139                                 for (tzlen = 0; !isspace(tmp[tzlen]); ++tzlen)
 140                                         ;
 141                                 if (tmp[0] == '"' && tmp[tzlen - 1] == '"') {
 142                                         tmp[tzlen - 1] = 0;
 143                                         setenv("TZ", tmp + 1, 1);
 144                                 } else {
 145                                         tmp[tzlen] = 0;
 146                                         setenv("TZ", tmp, 1);
 147                                 }
 148                                 while (isspace(tmp[tzlen]))
 149                                         ++tzlen;
 150                                 if (tmp[tzlen])
 151                                         v = vary_append(v, optarg + tzlen);
 152                         } else {
 153                                 v = vary_append(v, optarg);
 154                         }
 155                         break;
 156                 default:
 157                         usage();
 158                 }
 159         }
 160         argc -= optind;
 161         argv += optind;
 162
 163         if (!rflag && time(&tval) == -1)
 164                 err(1, "time");
 165
 166         format = "%+";
 167
 168         if (Rflag)
 169                 format = rfc2822_format;
 170         if (Iflag)
 171                 format = iso8601_selected->format;
 172
 173         /* allow the operands in any order */
 174         if (*argv && **argv == '+') {
 175                 if (Iflag || Rflag)
 176                         errx(1, "multiple output formats specified");
 177                 format = *argv + 1;
 178                 ++argv;
 179         }
 180
 181         if (*argv) {
 182                 setthetime(fmt, *argv, jflag);
 183                 ++argv;
 184         } else if (fmt != NULL)
 185                 usage();
 186
 187         if (*argv && **argv == '+') {
 188                 if (Iflag || Rflag)
 189                         errx(1, "multiple output formats specified");
 190                 format = *argv + 1;
 191         }
 192
 193         badv = vary_apply(v, tval, &lt);
 194         if (badv) {
 195                 fprintf(stderr, "%s: Cannot apply date adjustment\n",
 196                         badv->arg);
 197                 vary_destroy(v);
 198                 usage();
 199         }
 200         vary_destroy(v);
 201
 202         if (format == rfc2822_format) {
 203                 /*
 204                  * When using RFC 2822 datetime format, don't honor the
 205                  * locale.
 206                  */
 207                 setlocale(LC_TIME, "C");
 208         }
 209
 210         strftime(buf, sizeof(buf), format, &lt);
 211         if (Iflag && iso8601_selected > iso8601_fmts) {
 212                 strftime(tzbuf, sizeof(tzbuf), "%z", &lt);
 213                 memmove(&tzbuf[4], &tzbuf[3], 3);
 214                 tzbuf[3] = ':';
 215                 strlcat(buf, tzbuf, sizeof(buf));
 216         }
 217         printf("%s\n", buf);
 218         if (fflush(stdout) != 0)
 219                 err(1, "stdout");
 220         exit(EXIT_SUCCESS);
 221 }
 222
 223 #define ATOI2(s)        ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
 224
 225 static void
 226 setthetime(const char *fmt, const char *p, int jflag)
 227 {
 228         struct tm *lt;
 229         struct timeval tv;
 230         const char *dot, *t;
 231         int century;
 232
 233         if (fmt != NULL) {
 234                 lt = localtime(&tval);
 235                 t = strptime(p, fmt, lt);
 236                 if (t == NULL) {
 237                         fprintf(stderr, "Failed conversion of ``%s''"
 238                                 " using format ``%s''\n", p, fmt);
 239                         badformat();
 240                 } else if (*t != '\0')
 241                         fprintf(stderr, "Warning: Ignoring %ld extraneous"
 242                                 " characters in date string (%s)\n",
 243                                 (long) strlen(t), t);
 244         } else {
 245                 for (t = p, dot = NULL; *t; ++t) {
 246                         if (isdigit(*t))
 247                                 continue;
 248                         if (*t == '.' && dot == NULL) {
 249                                 dot = t;
 250                                 continue;
 251                         }
 252                         badformat();
 253                 }
 254
 255                 lt = localtime(&tval);
 256
 257                 if (dot != NULL) {                      /* .ss */
 258                         dot++; /* *dot++ = '\0'; */
 259                         if (strlen(dot) != 2)
 260                                 badformat();
 261                         lt->tm_sec = ATOI2(dot);
 262                         if (lt->tm_sec > 61)
 263                                 badformat();
 264                 } else
 265                         lt->tm_sec = 0;
 266
 267                 century = 0;
 268                 /* if p has a ".ss" field then let's pretend it's not there */
 269                 switch (strlen(p) - ((dot != NULL) ? 3 : 0)) {
 270                 case 12:                                /* cc */
 271                         lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE;
 272                         century = 1;
 273                         /* FALLTHROUGH */
 274                 case 10:                                /* yy */
 275                         if (century)
 276                                 lt->tm_year += ATOI2(p);
 277                         else {                          /* hack for 2000 ;-} */
 278                                 lt->tm_year = ATOI2(p);
 279                                 if (lt->tm_year < 69)
 280                                         lt->tm_year += 2000 - TM_YEAR_BASE;
 281                                 else
 282                                         lt->tm_year += 1900 - TM_YEAR_BASE;
 283                         }
 284                         /* FALLTHROUGH */
 285                 case 8:                                 /* mm */
 286                         lt->tm_mon = ATOI2(p);
 287                         if (lt->tm_mon > 12)
 288                                 badformat();
 289                         --lt->tm_mon;           /* time struct is 0 - 11 */
 290                         /* FALLTHROUGH */
 291                 case 6:                                 /* dd */
 292                         lt->tm_mday = ATOI2(p);
 293                         if (lt->tm_mday > 31)
 294                                 badformat();
 295                         /* FALLTHROUGH */
 296                 case 4:                                 /* HH */
 297                         lt->tm_hour = ATOI2(p);
 298                         if (lt->tm_hour > 23)
 299                                 badformat();
 300                         /* FALLTHROUGH */
 301                 case 2:                                 /* MM */
 302                         lt->tm_min = ATOI2(p);
 303                         if (lt->tm_min > 59)
 304                                 badformat();
 305                         break;
 306                 default:
 307                         badformat();
 308                 }
 309         }
 310
 311         /* Let mktime() decide whether summer time is in effect. */
 312         lt->tm_isdst = -1;
 313
 314         /* convert broken-down time to GMT clock time */
 315         if ((tval = mktime(lt)) == -1)
 316                 errx(1, "nonexistent time");
 317
 318         if (!jflag) {
 319                 logwtmpx("|", "date", "", 0, OLD_TIME);
 320                 tv.tv_sec = tval;
 321                 tv.tv_usec = 0;
 322                 if (settimeofday(&tv, NULL))
 323                         err(1, "settimeofday (timeval)");
 324                 logwtmpx("{", "date", "", 0, NEW_TIME);
 325
 326                 if ((p = getlogin()) == NULL)
 327                         p = "???";
 328                 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
 329         }
 330 }
 331
 332 static void
 333 badformat(void)
 334 {
 335         warnx("illegal time format");
 336         usage();
 337 }
 338
 339 static void
 340 usage(void)
 341 {
 342         fprintf(stderr, "%s\n%s\n",
 343             "usage: date [-jnRu] [-r seconds] [-v[+|-]val[ymwdHMS]] ... ",
 344             "            "
 345             "[-I [date | hours | minutes | seconds]]"
 346             "            "
 347             "[-f fmt date | [[[[[cc]yy]mm]dd]HH]MM[.ss]] [+format]");
 348         exit(1);
 349 }